Math Calculators

Random numbers from any range — repeats, sorting and sorting included.

Three percentage modes: percent of, percent change, and what percent.

Add, subtract, multiply or divide fractions and see the answer in lowest terms.

Standard deviation, variance and mean, with the step-by-step table.

Margin of error and confidence interval from a mean, spread and sample size.

P-values from a z-score, or the critical z for any significance level.

Turn a raw value into a z-score, percentile and normal-curve areas, or back again.

Real and complex roots, the discriminant, the vertex and the factored form.

Volume and surface area for boxes, cylinders, cones, spheres and pyramids.

Slope, angle, distance and line equation from two points.

Convert to and from scientific notation, and multiply, divide, add or subtract in it.

Any power, including negative and fractional exponents, with the same-base laws.

Log base b of a number, with ln, log2 and log10 beside it.

The square root or n-th root of a number, simplified and checked back.

Area of rectangles, circles, triangles, trapezoids and parallelograms.

Any one of radius, diameter, circumference or area fills in the other three.

Simplify ratios, complete proportions and split totals in a given ratio.

Mean, median, mode and range from a pasted list of numbers.

Type a full expression and get the answer as you type.

All sides, angles, area and perimeter from SSS, SAS, ASA or SSA measurements.